Merge pull request #77 from CodaFi/mailimap-has-oauth2

Added mailimap_has_xoauth2() to detect whether XOAUTH2 is available.
Travis build for libetpan
run apt-get as root on travis
Use autogen during travis build instead of configure.
Fixed travis build
Fixed warning
Support for retrieval of SSL certificates
Fixed memory leak
Fixed crash when fetch failed
Map the high level connect interface to CFNetwork when available
Some minor fixes to the CFStream on the high level interface
Merge pull request #78 from mronge/highlevel-cfstream-fix

Map the high level connect interface to CFNetwork when available
Fixed STARTTLS connection with CFNetwork
Fixed crash when using mailimap_enable()
Refactor call to mailstream_read()
Fixed build
Fixed build
Fixed build
Turn on SKIP_INSTALL so proper bundles are put together for the app store
Crasher fixes